1) SimpleJust select the plugin on server and viewer site, the standard vnc password is used

2) Long PasswordSet the passphrase, this is now the password you need to enter on in the viewer

3) Heavy encryptionYou don't need to enter a password, but only the viewer with the correct key can connectGenerates key and save them in the server folderIn this case 20190108_Server_ClientAuth.pubkey is the server keyand 20190108_Viewer_ClientAuth.pkey is the viewer keyNow copy the 20190108_Viewer_ClientAuth.pkey the viewer folder